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Finding the Fourth Proportional to 90.29, 135.32 and 74.45

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Solution

The fourth proportional to 90.29, 135.32 and 74.45 is: 111.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.29 : 135.32 = 74.45 : x
  2. Step 2: Convert to fraction form
    90.29/135.32 = 74.45/x
  3. Step 3: Cross multiply
    90.29x = 135.32 × 74.45
  4. Step 4: Simplify right side
    90.29x = 10,074.20
  5. Step 5: Solve for x
    x = 10,074.20/90.29
  6. Step 6: Final answer
    x = 111.58

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.